Whale Browser before 4.33.325.17 allows an attacker to escape the iframe sandbox in a dual-tab environment.
Description
Whale Browser before 4.33.325.17 allows an attacker to escape the iframe sandbox in a dual-tab environment.
AI Analyst Comment
Remediation
Update Whale Browser before Multiple Products to the latest version. Monitor for exploitation attempts and review access logs.
Executive Summary:
A critical vulnerability, identified as CVE-2025-62583, has been discovered in Naver's Whale Browser. This flaw allows a remote attacker to bypass the browser's security sandbox, potentially leading to arbitrary code execution on a user's system by tricking them into visiting a malicious website. Due to its critical severity (CVSS 9.8), successful exploitation could result in a complete compromise of the affected workstation, posing a significant risk to organizational data and network security.
Vulnerability Details
CVE-ID: CVE-2025-62583
Affected Software: Whale Browser
Affected Versions: All versions prior to 4.33.325.17
Vulnerability: The vulnerability is a sandbox escape flaw that exists specifically within the browser's dual-tab environment. An iframe sandbox is a security mechanism designed to isolate and restrict the actions of embedded content within a webpage. This flaw allows a specially crafted webpage to bypass these restrictions when rendered in a dual-tab view. An attacker can exploit this by hosting a malicious page with a crafted iframe; when a user running a vulnerable version of Whale Browser visits this page, the code within the iframe can "escape" its intended confinement and execute commands with the full permissions of the browser process on the user's operating system.
Business Impact
This vulnerability is rated as critical severity with a CVSS score of 9.8. Successful exploitation could lead to a complete compromise of the affected user's workstation, introducing severe risks to the organization. Potential consequences include the theft of sensitive corporate data and user credentials, installation of malware such as ransomware or spyware, and the attacker gaining an initial foothold for lateral movement across the corporate network. This directly threatens the confidentiality, integrity, and availability of business-critical information and systems.
Remediation Plan
Immediate Action: The primary remediation is to apply the security update provided by the vendor. All systems running Whale Browser must be updated to version 4.33.325.17 or later immediately. System administrators should prioritize the deployment of this patch across all endpoints where the browser is installed.
Proactive Monitoring: Security teams should actively monitor for signs of exploitation. This includes inspecting endpoint detection and response (EDR) logs for unusual child processes spawned by
whale.exe, reviewing network logs for outbound connections from workstations to suspicious or unknown domains, and analyzing web proxy logs for visits to malicious websites.Compensating Controls: If immediate patching is not feasible, the following compensating controls can reduce risk:
Exploitation Status
Public Exploit Available: false
Analyst Notes: As of October 16, 2025, there are no known public exploits or active exploitation campaigns targeting this vulnerability. However, due to the critical severity and the nature of sandbox escape vulnerabilities, it is highly likely that proof-of-concept code will be developed by security researchers and threat actors. The vulnerability is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
Analyst Recommendation
Given the critical severity (CVSS 9.8) and the potential for a remote, unauthenticated attacker to achieve full system compromise, this vulnerability poses a significant and immediate threat. We strongly recommend that organizations prioritize the deployment of the vendor-supplied patch to all affected systems without delay. Even without evidence of active exploitation, the severity of this flaw warrants immediate action to prevent it from becoming a future attack vector.